GRB 120521C: Swift-XRT refined analysis. Stroh, M. C. ; Burrows, D. N. ; Evans, P. A. ; Littlejohns, O. M. ; Osborne, J. P. ; Maselli, A. ; Mangano, V. ; Melandri, A. ; Kennea, J. A. ; Baumgartner, W. H. Abstract Publication: GRB Coordinates Network Pub Date: 2012 Bibcode: 2012GCN.13334....1S